1 | MODULE dynspg_ts |
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2 | !!====================================================================== |
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3 | !! *** MODULE dynspg_ts *** |
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4 | !! Ocean dynamics: surface pressure gradient trend |
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5 | !!====================================================================== |
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6 | #if ( defined key_dynspg_ts && ! defined key_autotasking ) || defined key_esopa |
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7 | !!---------------------------------------------------------------------- |
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8 | !! 'key_dynspg_ts' free surface cst volume with time splitting |
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9 | !! NOT 'key_autotasking' k-j-i loop (vector opt.) |
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10 | !!---------------------------------------------------------------------- |
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11 | !! dyn_spg_ts : compute surface pressure gradient trend using a time- |
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12 | !! splitting scheme and add to the general trend |
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13 | !!---------------------------------------------------------------------- |
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14 | !! * Modules used |
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15 | USE oce ! ocean dynamics and tracers |
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16 | USE dom_oce ! ocean space and time domain |
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17 | USE phycst ! physical constants |
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18 | USE ocesbc ! ocean surface boundary condition |
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19 | USE dynvor ! vorticity term |
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20 | USE obc_oce ! Lateral open boundary condition |
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21 | USE lib_mpp ! distributed memory computing library |
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22 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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23 | USE prtctl ! Print control |
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24 | USE in_out_manager ! I/O manager |
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25 | |
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26 | IMPLICIT NONE |
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27 | PRIVATE |
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28 | |
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29 | !! * Accessibility |
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30 | PUBLIC dyn_spg_ts ! routine called by step.F90 |
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31 | |
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32 | !! * Module variables |
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33 | REAL(wp), PUBLIC, DIMENSION(jpi,jpj) :: & ! variables averaged over the barotropic loop |
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34 | sshn_b, sshb_b, & ! sea surface heigth (now, before) |
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35 | un_b , vn_b ! vertically integrated horizontal velocities (now) |
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36 | |
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37 | !! * Substitutions |
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38 | # include "domzgr_substitute.h90" |
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39 | # include "vectopt_loop_substitute.h90" |
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40 | !!---------------------------------------------------------------------- |
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41 | !! OPA 9.0 , LOCEAN-IPSL (2005) |
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42 | !! $Header$ |
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43 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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44 | !!---------------------------------------------------------------------- |
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45 | |
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46 | CONTAINS |
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47 | |
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48 | SUBROUTINE dyn_spg_ts( kt ) |
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49 | !!---------------------------------------------------------------------- |
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50 | !! *** routine dyn_spg_ts *** |
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51 | !! |
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52 | !! ** Purpose : Compute the now trend due to the surface pressure |
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53 | !! gradient in case of free surface formulation with time-splitting. |
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54 | !! Add it to the general trend of momentum equation. |
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55 | !! Compute the free surface. |
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56 | !! |
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57 | !! ** Method : Free surface formulation with time-splitting |
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58 | !! -1- Save the vertically integrated trend. This general trend is |
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59 | !! held constant over the barotropic integration. |
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60 | !! The Coriolis force is removed from the general trend as the |
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61 | !! surface gradient and the Coriolis force are updated within |
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62 | !! the barotropic integration. |
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63 | !! -2- Barotropic loop : updates of sea surface height (zssha_e) and |
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64 | !! barotropic transports (zua_e and zva_e) through barotropic |
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65 | !! momentum and continuity integration. Barotropic former |
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66 | !! variables are time averaging over the full barotropic cycle |
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67 | !! (= 2 * baroclinic time step) and saved in zsshX_b, zuX_b |
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68 | !! and zvX_b (X specifying after, now or before). |
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69 | !! -3- Update of sea surface height from time averaged barotropic |
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70 | !! variables. |
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71 | !! - apply lateral boundary conditions on sshn. |
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72 | !! -4- The new general trend becomes : |
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73 | !! ua = ua - sum_k(ua)/H + ( zua_b - sum_k(ub) )/H |
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74 | !! |
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75 | !! ** Action : - Update (ua,va) with the surf. pressure gradient trend |
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76 | !! |
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77 | !! References : |
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78 | !! Griffies et al., (2003): A technical guide to MOM4. NOAA/GFDL |
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79 | !! |
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80 | !! History : |
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81 | !! 9.0 ! 04-12 (L. Bessieres, G. Madec) Original code |
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82 | !! ! 05-11 (V. Garnier, G. Madec) optimization |
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83 | !!--------------------------------------------------------------------- |
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84 | !! * Arguments |
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85 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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86 | |
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87 | !! * Local declarations |
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88 | INTEGER :: ji, jj, jk, jit ! dummy loop indices |
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89 | INTEGER :: icycle ! temporary scalar |
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90 | REAL(wp) :: & |
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91 | zraur, zcoef, z2dt_e, z2dt_b, zfac25, & ! temporary scalars |
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92 | zfact1, zspgu, zcubt, zx1, zy1, & ! " " |
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93 | zfact2, zspgv, zcvbt, zx2, zy2 ! " " |
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94 | REAL(wp), DIMENSION(jpi,jpj) :: & |
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95 | zcu, zcv, zwx, zwy, zhdiv, & ! temporary arrays |
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96 | zua, zva, zub, zvb, & ! " " |
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97 | zssha_b, zua_b, zva_b, & ! " " |
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98 | zsshb_e, zub_e, zvb_e, & ! " " |
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99 | zsshn_e, zun_e, zvn_e, & ! " " |
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100 | zssha_e, zua_e, zva_e ! " " |
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101 | REAL(wp), DIMENSION(jpi,jpj),SAVE :: & |
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102 | ztnw, ztne, ztsw, ztse |
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103 | !!---------------------------------------------------------------------- |
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104 | |
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105 | ! Arrays initialization |
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106 | ! --------------------- |
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107 | zua_b(:,:) = 0.e0 ; zub_e(:,:) = 0.e0 ; zun_e(:,:) = 0.e0 ; zua_e(:,:) = 0.e0 |
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108 | zva_b(:,:) = 0.e0 ; zvb_e(:,:) = 0.e0 ; zvn_e(:,:) = 0.e0 ; zva_e(:,:) = 0.e0 |
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109 | zhdiv(:,:) = 0.e0 |
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110 | |
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111 | |
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112 | IF( kt == nit000 ) THEN |
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113 | |
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114 | IF(lwp) WRITE(numout,*) |
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115 | IF(lwp) WRITE(numout,*) 'dyn_spg_ts : surface pressure gradient trend' |
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116 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~ free surface with time splitting' |
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117 | IF(lwp) WRITE(numout,*) ' Number of sub cycle in 1 time-step (2 rdt) : icycle = ', FLOOR( 2*rdt/rdtbt ) |
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118 | |
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119 | IF( ln_rstart ) THEN |
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120 | ! initialize barotropic specific arrays |
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121 | sshb_b(:,:) = sshb(:,:) |
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122 | sshn_b(:,:) = sshn(:,:) |
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123 | un_b(:,:) = 0.e0 |
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124 | vn_b(:,:) = 0.e0 |
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125 | ! vertical sum |
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126 | IF( lk_vopt_loop ) THEN ! vector opt., forced unroll |
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127 | DO jk = 1, jpkm1 |
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128 | DO ji = 1, jpij |
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129 | un_b(ji,1) = un_b(ji,1) + fse3u(ji,1,jk) * un(ji,1,jk) |
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130 | vn_b(ji,1) = vn_b(ji,1) + fse3v(ji,1,jk) * vn(ji,1,jk) |
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131 | END DO |
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132 | END DO |
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133 | ELSE ! No vector opt. |
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134 | DO jk = 1, jpkm1 |
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135 | un_b(:,:) = un_b(:,:) + fse3u(:,:,jk) * un(:,:,jk) |
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136 | vn_b(:,:) = vn_b(:,:) + fse3v(:,:,jk) * vn(:,:,jk) |
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137 | END DO |
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138 | ENDIF |
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139 | ENDIF |
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140 | zssha_e(:,:) = sshn(:,:) |
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141 | zua_e (:,:) = un_b(:,:) |
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142 | zva_e (:,:) = vn_b(:,:) |
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143 | |
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144 | IF( ln_dynvor_een ) THEN |
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145 | ztne(1,:) = 0.e0 ; ztnw(1,:) = 0.e0 ; ztse(1,:) = 0.e0 ; ztsw(1,:) = 0.e0 |
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146 | DO jj = 2, jpj |
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147 | DO ji = fs_2, jpi ! vector opt. |
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148 | ztne(ji,jj) = ( ff(ji-1,jj ) + ff(ji ,jj ) + ff(ji ,jj-1) ) / 3. |
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149 | ztnw(ji,jj) = ( ff(ji-1,jj-1) + ff(ji-1,jj ) + ff(ji ,jj ) ) / 3. |
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150 | ztse(ji,jj) = ( ff(ji ,jj ) + ff(ji ,jj-1) + ff(ji-1,jj-1) ) / 3. |
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151 | ztsw(ji,jj) = ( ff(ji ,jj-1) + ff(ji-1,jj-1) + ff(ji-1,jj ) ) / 3. |
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152 | END DO |
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153 | END DO |
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154 | ENDIF |
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155 | |
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156 | ENDIF |
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157 | |
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158 | ! Local constant initialization |
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159 | ! -------------------------------- |
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160 | z2dt_b = 2.0 * rdt ! baroclinic time step |
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161 | IF ( neuler == 0 .AND. kt == nit000 ) z2dt_b = rdt |
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162 | zfact1 = 0.5 * 0.25 ! coefficient for vorticity estimates |
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163 | zfact2 = 0.5 * 0.5 |
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164 | zraur = 1. / rauw ! 1 / volumic mass of pure water |
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165 | |
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166 | ! ----------------------------------------------------------------------------- |
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167 | ! Phase 1 : Coupling between general trend and barotropic estimates (1st step) |
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168 | ! ----------------------------------------------------------------------------- |
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169 | |
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170 | ! Vertically integrated quantities |
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171 | ! -------------------------------- |
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172 | zua(:,:) = 0.e0 |
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173 | zva(:,:) = 0.e0 |
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174 | zub(:,:) = 0.e0 |
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175 | zvb(:,:) = 0.e0 |
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176 | zwx(:,:) = 0.e0 |
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177 | zwy(:,:) = 0.e0 |
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178 | |
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179 | ! vertical sum |
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180 | IF( lk_vopt_loop ) THEN ! vector opt., forced unroll |
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181 | DO jk = 1, jpkm1 |
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182 | DO ji = 1, jpij |
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183 | ! ! Vertically integrated momentum trends |
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184 | zua(ji,1) = zua(ji,1) + fse3u(ji,1,jk) * umask(ji,1,jk) * ua(ji,1,jk) |
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185 | zva(ji,1) = zva(ji,1) + fse3v(ji,1,jk) * vmask(ji,1,jk) * va(ji,1,jk) |
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186 | ! ! Vertically integrated transports (before) |
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187 | zub(ji,1) = zub(ji,1) + fse3u(ji,1,jk) * ub(ji,1,jk) |
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188 | zvb(ji,1) = zvb(ji,1) + fse3v(ji,1,jk) * vb(ji,1,jk) |
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189 | ! ! Planetary vorticity transport fluxes (now) |
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190 | zwx(ji,1) = zwx(ji,1) + e2u(ji,1) * fse3u(ji,1,jk) * un(ji,1,jk) |
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191 | zwy(ji,1) = zwy(ji,1) + e1v(ji,1) * fse3v(ji,1,jk) * vn(ji,1,jk) |
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192 | END DO |
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193 | END DO |
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194 | ELSE ! No vector opt. |
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195 | DO jk = 1, jpkm1 |
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196 | ! ! Vertically integrated momentum trends |
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197 | zua(:,:) = zua(:,:) + fse3u(:,:,jk) * umask(:,:,jk) * ua(:,:,jk) |
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198 | zva(:,:) = zva(:,:) + fse3v(:,:,jk) * vmask(:,:,jk) * va(:,:,jk) |
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199 | ! ! Vertically integrated transports (before) |
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200 | zub(:,:) = zub(:,:) + fse3u(:,:,jk) * ub(:,:,jk) |
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201 | zvb(:,:) = zvb(:,:) + fse3v(:,:,jk) * vb(:,:,jk) |
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202 | ! ! Planetary vorticity (now) |
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203 | zwx(:,:) = zwx(:,:) + e2u(:,:) * fse3u(:,:,jk) * un(:,:,jk) |
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204 | zwy(:,:) = zwy(:,:) + e1v(:,:) * fse3v(:,:,jk) * vn(:,:,jk) |
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205 | END DO |
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206 | ENDIF |
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207 | |
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208 | IF( ln_dynvor_ene .OR. ln_dynvor_mix ) THEN ! energy conserving or mixed scheme |
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209 | DO jj = 2, jpjm1 |
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210 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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211 | zy1 = ( zwy(ji,jj-1) + zwy(ji+1,jj-1) ) / e1u(ji,jj) |
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212 | zy2 = ( zwy(ji,jj ) + zwy(ji+1,jj ) ) / e1u(ji,jj) |
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213 | zx1 = ( zwx(ji-1,jj) + zwx(ji-1,jj+1) ) / e2v(ji,jj) |
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214 | zx2 = ( zwx(ji ,jj) + zwx(ji ,jj+1) ) / e2v(ji,jj) |
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215 | ! energy conserving formulation for planetary vorticity term |
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216 | zcu(ji,jj) = zfact2 * ( ff(ji ,jj-1) * zy1 + ff(ji,jj) * zy2 ) |
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217 | zcv(ji,jj) =-zfact2 * ( ff(ji-1,jj ) * zx1 + ff(ji,jj) * zx2 ) |
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218 | END DO |
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219 | END DO |
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220 | |
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221 | ELSEIF ( ln_dynvor_ens ) THEN ! enstrophy conserving scheme |
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222 | DO jj = 2, jpjm1 |
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223 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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224 | zy1 = zfact1 * ( zwy(ji ,jj-1) + zwy(ji+1,jj-1) & |
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225 | + zwy(ji ,jj ) + zwy(ji+1,jj ) ) / e1u(ji,jj) |
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226 | zx1 =-zfact1 * ( zwx(ji-1,jj ) + zwx(ji-1,jj+1) & |
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227 | + zwx(ji ,jj ) + zwx(ji ,jj+1) ) / e2v(ji,jj) |
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228 | zcu(ji,jj) = zy1 * ( ff(ji ,jj-1) + ff(ji,jj) ) |
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229 | zcv(ji,jj) = zx1 * ( ff(ji-1,jj ) + ff(ji,jj) ) |
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230 | END DO |
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231 | END DO |
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232 | |
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233 | ELSEIF ( ln_dynvor_een ) THEN ! enstrophy and energy conserving scheme |
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234 | zfac25 = 0.25 |
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235 | DO jj = 2, jpjm1 |
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236 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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237 | zcu(ji,jj) = + zfac25 / e1u(ji,jj) & |
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238 | & * ( ztne(ji,jj ) * zwy(ji ,jj ) + ztnw(ji+1,jj) * zwy(ji+1,jj ) & |
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239 | & + ztse(ji,jj ) * zwy(ji ,jj-1) + ztsw(ji+1,jj) * zwy(ji+1,jj-1) ) |
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240 | zcv(ji,jj) = - zfac25 / e2v(ji,jj) & |
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241 | & * ( ztsw(ji,jj+1) * zwx(ji-1,jj+1) + ztse(ji,jj+1) * zwx(ji ,jj+1) & |
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242 | & + ztnw(ji,jj ) * zwx(ji-1,jj ) + ztne(ji,jj ) * zwx(ji ,jj ) ) |
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243 | END DO |
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244 | END DO |
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245 | |
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246 | ENDIF |
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247 | |
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248 | |
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249 | ! Remove barotropic trend from general momentum trend |
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250 | ! --------------------------------------------------- |
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251 | DO jk = 1 , jpkm1 |
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252 | DO jj = 2, jpjm1 |
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253 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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254 | ua(ji,jj,jk) = ua(ji,jj,jk) - zua(ji,jj) * hur(ji,jj) |
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255 | va(ji,jj,jk) = va(ji,jj,jk) - zva(ji,jj) * hvr(ji,jj) |
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256 | END DO |
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257 | END DO |
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258 | END DO |
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259 | |
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260 | ! Remove coriolis term from barotropic trend |
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261 | ! ------------------------------------------ |
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262 | DO jj = 2, jpjm1 |
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263 | DO ji = fs_2, fs_jpim1 |
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264 | zua(ji,jj) = zua(ji,jj) - zcu(ji,jj) |
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265 | zva(ji,jj) = zva(ji,jj) - zcv(ji,jj) |
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266 | END DO |
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267 | END DO |
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268 | |
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269 | ! ----------------------------------------------------------------------- |
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270 | ! Phase 2 : Integration of the barotropic equations with time splitting |
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271 | ! ----------------------------------------------------------------------- |
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272 | |
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273 | ! Initialisations |
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274 | !---------------- |
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275 | ! Number of iteration of the barotropic loop |
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276 | icycle = FLOOR( z2dt_b / rdtbt ) |
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277 | |
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278 | ! variables for the barotropic equations |
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279 | zsshb_e(:,:) = sshn_b(:,:) ! (barotropic) sea surface height (before and now) |
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280 | zsshn_e(:,:) = sshn_b(:,:) |
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281 | zub_e(:,:) = un_b(:,:) ! barotropic transports issued from the barotropic equations (before and now) |
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282 | zvb_e(:,:) = vn_b(:,:) |
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283 | zun_e(:,:) = un_b(:,:) |
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284 | zvn_e(:,:) = vn_b(:,:) |
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285 | zssha_b(:,:) = sshn(:,:) ! time averaged variables over all sub-timesteps |
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286 | zua_b(:,:) = un_b(:,:) |
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287 | zva_b(:,:) = vn_b(:,:) |
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288 | |
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289 | ! Barotropic integration over 2 baroclinic time steps |
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290 | ! --------------------------------------------------- |
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291 | |
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292 | ! ! ==================== ! |
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293 | DO jit = 1, icycle ! sub-time-step loop ! |
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294 | ! ! ==================== ! |
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295 | |
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296 | z2dt_e = 2. * rdtbt |
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297 | IF ( jit == 1 ) z2dt_e = rdtbt |
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298 | |
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299 | ! Horizontal divergence of barotropic transports |
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300 | !-------------------------------------------------- |
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301 | DO jj = 2, jpjm1 |
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302 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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303 | zhdiv(ji,jj) = ( e2u(ji ,jj ) * zun_e(ji ,jj) & |
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304 | & -e2u(ji-1,jj ) * zun_e(ji-1,jj) & |
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305 | & +e1v(ji ,jj ) * zvn_e(ji ,jj) & |
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306 | & -e1v(ji ,jj-1) * zvn_e(ji ,jj-1) ) & |
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307 | & / (e1t(ji,jj)*e2t(ji,jj)) |
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308 | END DO |
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309 | END DO |
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310 | |
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311 | #if defined key_obc |
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312 | ! open boundaries (div must be zero behind the open boundary) |
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313 | ! mpp remark: The zeroing of hdiv can probably be extended to 1->jpi/jpj for the correct row/column |
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314 | IF( lp_obc_east ) zhdiv(nie0p1:nie1p1,nje0 :nje1) = 0.e0 ! east |
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315 | IF( lp_obc_west ) zhdiv(niw0 :niw1 ,njw0 :njw1) = 0.e0 ! west |
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316 | IF( lp_obc_north ) zhdiv(nin0 :nin1 ,njn0p1:njn1p1) = 0.e0 ! north |
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317 | IF( lp_obc_south ) zhdiv(nis0 :nis1 ,njs0 :njs1) = 0.e0 ! south |
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318 | #endif |
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319 | |
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320 | ! Sea surface height from the barotropic system |
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321 | !---------------------------------------------- |
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322 | DO jj = 2, jpjm1 |
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323 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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324 | zssha_e(ji,jj) = ( zsshb_e(ji,jj) - z2dt_e * ( zraur * emp(ji,jj) & |
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325 | & + zhdiv(ji,jj) ) ) * tmask(ji,jj,1) |
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326 | END DO |
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327 | END DO |
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328 | |
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329 | ! evolution of the barotropic transport ( following the vorticity scheme used) |
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330 | ! ---------------------------------------------------------------------------- |
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331 | zwx(:,:) = e2u(:,:) * zun_e(:,:) |
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332 | zwy(:,:) = e1v(:,:) * zvn_e(:,:) |
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333 | |
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334 | IF( ln_dynvor_ene .OR. ln_dynvor_mix ) THEN ! energy conserving or mixed scheme |
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335 | DO jj = 2, jpjm1 |
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336 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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337 | ! surface pressure gradient |
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338 | zspgu = -grav * ( zsshn_e(ji+1,jj) - zsshn_e(ji,jj) ) * hu(ji,jj) / e1u(ji,jj) |
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339 | zspgv = -grav * ( zsshn_e(ji,jj+1) - zsshn_e(ji,jj) ) * hv(ji,jj) / e2v(ji,jj) |
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340 | ! energy conserving formulation for planetary vorticity term |
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341 | zy1 = ( zwy(ji ,jj-1) + zwy(ji+1,jj-1) ) / e1u(ji,jj) |
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342 | zy2 = ( zwy(ji ,jj ) + zwy(ji+1,jj ) ) / e1u(ji,jj) |
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343 | zx1 = ( zwx(ji-1,jj ) + zwx(ji-1,jj+1) ) / e2v(ji,jj) |
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344 | zx2 = ( zwx(ji ,jj ) + zwx(ji ,jj+1) ) / e2v(ji,jj) |
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345 | zcubt = zfact2 * ( ff(ji ,jj-1) * zy1 + ff(ji,jj) * zy2 ) |
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346 | zcvbt =-zfact2 * ( ff(ji-1,jj ) * zx1 + ff(ji,jj) * zx2 ) |
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347 | ! after transports |
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348 | zua_e(ji,jj) = ( zub_e(ji,jj) + z2dt_e * ( zcubt + zspgu + zua(ji,jj) ) ) * umask(ji,jj,1) |
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349 | zva_e(ji,jj) = ( zvb_e(ji,jj) + z2dt_e * ( zcvbt + zspgv + zva(ji,jj) ) ) * vmask(ji,jj,1) |
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350 | END DO |
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351 | END DO |
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352 | |
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353 | ELSEIF ( ln_dynvor_ens ) THEN ! enstrophy conserving scheme |
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354 | DO jj = 2, jpjm1 |
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355 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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356 | ! surface pressure gradient |
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357 | zspgu = -grav * ( zsshn_e(ji+1,jj) - zsshn_e(ji,jj) ) * hu(ji,jj) / e1u(ji,jj) |
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358 | zspgv = -grav * ( zsshn_e(ji,jj+1) - zsshn_e(ji,jj) ) * hv(ji,jj) / e2v(ji,jj) |
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359 | ! enstrophy conserving formulation for planetary vorticity term |
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360 | zy1 = zfact1 * ( zwy(ji ,jj-1) + zwy(ji+1,jj-1) & |
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361 | + zwy(ji ,jj ) + zwy(ji+1,jj ) ) / e1u(ji,jj) |
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362 | zx1 =-zfact1 * ( zwx(ji-1,jj ) + zwx(ji-1,jj+1) & |
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363 | + zwx(ji ,jj ) + zwx(ji ,jj+1) ) / e2v(ji,jj) |
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364 | zcubt = zy1 * ( ff(ji ,jj-1) + ff(ji,jj) ) |
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365 | zcvbt = zx1 * ( ff(ji-1,jj ) + ff(ji,jj) ) |
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366 | ! after transports |
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367 | zua_e(ji,jj) = ( zub_e(ji,jj) + z2dt_e * ( zcubt + zspgu + zua(ji,jj) ) ) * umask(ji,jj,1) |
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368 | zva_e(ji,jj) = ( zvb_e(ji,jj) + z2dt_e * ( zcvbt + zspgv + zva(ji,jj) ) ) * vmask(ji,jj,1) |
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369 | END DO |
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370 | END DO |
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371 | |
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372 | ELSEIF ( ln_dynvor_een ) THEN ! energy and enstrophy conserving scheme |
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373 | zfac25 = 0.25 |
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374 | DO jj = 2, jpjm1 |
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375 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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376 | ! surface pressure gradient |
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377 | zspgu = -grav * ( zsshn_e(ji+1,jj) - zsshn_e(ji,jj) ) * hu(ji,jj) / e1u(ji,jj) |
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378 | zspgv = -grav * ( zsshn_e(ji,jj+1) - zsshn_e(ji,jj) ) * hv(ji,jj) / e2v(ji,jj) |
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379 | ! energy/enstrophy conserving formulation for planetary vorticity term |
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380 | zcubt = + zfac25 / e1u(ji,jj) * ( ztne(ji,jj ) * zwy(ji ,jj ) + ztnw(ji+1,jj) * zwy(ji+1,jj ) & |
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381 | & + ztse(ji,jj ) * zwy(ji ,jj-1) + ztsw(ji+1,jj) * zwy(ji+1,jj-1) ) |
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382 | zcvbt = - zfac25 / e2v(ji,jj) * ( ztsw(ji,jj+1) * zwx(ji-1,jj+1) + ztse(ji,jj+1) * zwx(ji ,jj+1) & |
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383 | & + ztnw(ji,jj ) * zwx(ji-1,jj ) + ztne(ji,jj ) * zwx(ji ,jj ) ) |
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384 | ! after transports |
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385 | zua_e(ji,jj) = ( zub_e(ji,jj) + z2dt_e * ( zcubt + zspgu + zua(ji,jj) ) ) * umask(ji,jj,1) |
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386 | zva_e(ji,jj) = ( zvb_e(ji,jj) + z2dt_e * ( zcvbt + zspgv + zva(ji,jj) ) ) * vmask(ji,jj,1) |
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387 | END DO |
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388 | END DO |
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389 | ENDIF |
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390 | |
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391 | ! ... Boundary conditions on zua_e, zva_e, zssha_e |
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392 | CALL lbc_lnk( zua_e, 'U', -1. ) |
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393 | CALL lbc_lnk( zva_e, 'V', -1. ) |
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394 | CALL lbc_lnk( zssha_e, 'T', 1. ) |
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395 | |
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396 | ! temporal sum |
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397 | !------------- |
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398 | zssha_b(:,:) = zssha_b(:,:) + zssha_e(:,:) |
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399 | zua_b (:,:) = zua_b (:,:) + zua_e (:,:) |
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400 | zva_b (:,:) = zva_b (:,:) + zva_e (:,:) |
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401 | |
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402 | ! Time filter and swap of dynamics arrays |
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403 | ! --------------------------------------- |
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404 | IF( neuler == 0 .AND. kt == nit000 ) THEN ! Euler (forward) time stepping |
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405 | zsshb_e(:,:) = zsshn_e(:,:) |
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406 | zub_e (:,:) = zun_e (:,:) |
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407 | zvb_e (:,:) = zvn_e (:,:) |
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408 | zsshn_e(:,:) = zssha_e(:,:) |
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409 | zun_e (:,:) = zua_e (:,:) |
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410 | zvn_e (:,:) = zva_e (:,:) |
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411 | ELSE ! Asselin filtering |
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412 | zsshb_e(:,:) = atfp * ( zsshb_e(:,:) + zssha_e(:,:) ) + atfp1 * zsshn_e(:,:) |
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413 | zub_e (:,:) = atfp * ( zub_e (:,:) + zua_e (:,:) ) + atfp1 * zun_e (:,:) |
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414 | zvb_e (:,:) = atfp * ( zvb_e (:,:) + zva_e (:,:) ) + atfp1 * zvn_e (:,:) |
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415 | zsshn_e(:,:) = zssha_e(:,:) |
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416 | zun_e (:,:) = zua_e (:,:) |
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417 | zvn_e (:,:) = zva_e (:,:) |
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418 | ENDIF |
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419 | |
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420 | ! ! ==================== ! |
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421 | END DO ! end loop ! |
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422 | ! ! ==================== ! |
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423 | |
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424 | |
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425 | ! Time average of after barotropic variables |
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426 | zcoef = 1.e0 / ( FLOAT( icycle +1 ) ) |
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427 | zssha_b(:,:) = zcoef * zssha_b(:,:) |
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428 | zua_b (:,:) = zcoef * zua_b (:,:) |
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429 | zva_b (:,:) = zcoef * zva_b (:,:) |
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430 | |
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431 | |
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432 | ! --------------------------------------------------------------------------- |
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433 | ! Phase 3 : Update sea surface height from time averaged barotropic variables |
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434 | ! --------------------------------------------------------------------------- |
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435 | |
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436 | |
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437 | ! Horizontal divergence of time averaged barotropic transports |
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438 | !------------------------------------------------------------- |
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439 | DO jj = 2, jpjm1 |
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440 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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441 | zhdiv(ji,jj) = ( e2u(ji,jj) * un_b(ji,jj) - e2u(ji-1,jj ) * un_b(ji-1,jj ) & |
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442 | & +e1v(ji,jj) * vn_b(ji,jj) - e1v(ji ,jj-1) * vn_b(ji ,jj-1) ) & |
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443 | & / ( e1t(ji,jj) * e2t(ji,jj) ) |
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444 | END DO |
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445 | END DO |
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446 | |
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447 | #if defined key_obc |
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448 | ! open boundaries (div must be zero behind the open boundary) |
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449 | ! mpp remark: The zeroing of hdiv can probably be extended to 1->jpi/jpj for the correct row/column |
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450 | IF( lp_obc_east ) zhdiv(nie0p1:nie1p1,nje0 :nje1) = 0.e0 ! east |
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451 | IF( lp_obc_west ) zhdiv(niw0 :niw1 ,njw0 :njw1) = 0.e0 ! west |
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452 | IF( lp_obc_north ) zhdiv(nin0 :nin1 ,njn0p1:njn1p1) = 0.e0 ! north |
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453 | IF( lp_obc_south ) zhdiv(nis0 :nis1 ,njs0 :njs1) = 0.e0 ! south |
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454 | #endif |
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455 | |
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456 | ! sea surface height |
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457 | !------------------- |
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458 | sshb(:,:) = sshn(:,:) |
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459 | sshn(:,:) = ( sshb_b(:,:) - z2dt_b * ( zraur * emp(:,:) + zhdiv(:,:) ) ) * tmask(:,:,1) |
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460 | |
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461 | ! ... Boundary conditions on sshn |
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462 | CALL lbc_lnk( sshn, 'T', 1. ) |
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463 | |
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464 | |
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465 | ! ----------------------------------------------------------------------------- |
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466 | ! Phase 4. Coupling between general trend and barotropic estimates - (2nd step) |
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467 | ! ----------------------------------------------------------------------------- |
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468 | |
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469 | ! Swap on time averaged barotropic variables |
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470 | ! ------------------------------------------ |
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471 | sshb_b(:,:) = sshn_b (:,:) |
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472 | sshn_b(:,:) = zssha_b(:,:) |
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473 | un_b (:,:) = zua_b (:,:) |
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474 | vn_b (:,:) = zva_b (:,:) |
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475 | |
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476 | ! add time averaged barotropic coriolis and surface pressure gradient |
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477 | ! terms to the general momentum trend |
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478 | ! -------------------------------------------------------------------- |
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479 | DO jk=1,jpkm1 |
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480 | ua(:,:,jk) = ua(:,:,jk) + hur(:,:) * ( zua_b(:,:) - zub(:,:) ) / z2dt_b |
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481 | va(:,:,jk) = va(:,:,jk) + hvr(:,:) * ( zva_b(:,:) - zvb(:,:) ) / z2dt_b |
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482 | END DO |
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483 | |
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484 | IF(ln_ctl) THEN ! print sum trends (used for debugging) |
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485 | CALL prt_ctl(tab2d_1=sshn, clinfo1=' ssh : ', mask1=tmask) |
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486 | ENDIF |
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487 | |
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488 | END SUBROUTINE dyn_spg_ts |
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489 | #else |
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490 | !!---------------------------------------------------------------------- |
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491 | !! Default case : Empty module No standart free surface cst volume |
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492 | !!---------------------------------------------------------------------- |
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493 | CONTAINS |
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494 | SUBROUTINE dyn_spg_ts( kt ) ! Empty routine |
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495 | WRITE(*,*) 'dyn_spg_ts: You should not have seen this print! error?', kt |
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496 | END SUBROUTINE dyn_spg_ts |
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497 | #endif |
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498 | |
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499 | !!====================================================================== |
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500 | END MODULE dynspg_ts |
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